CVE-2023-34192
KEVSynacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability
Description
Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting (XSS) vulnerability that allows a remote authenticated attacker to execute arbitrary code via a crafted script to the /h/autoSaveDraft function.
Cross Site Scripting vulnerability in Zimbra ZCS v.8.8.15 allows a remote authenticated attacker to execute arbitrary code via a crafted script to the /h/autoSaveDraft function.
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:HPublishedJul 6, 2023
Last modifiedJun 17, 2026
Added to KEVFeb 25, 2025
Remediation dueMar 18, 2025
References
- wiki.zimbra.com/wiki/Security_CenterRelease NotesVendor Advisory
- wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_PolicyNot Applicable
- wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-34192US Government Resource
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83
Risk assessment · Critical
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 588 days
- CVSS
- 9.0 CRITICAL
- EPSS (30-day exploit probability)
- 77.3% · top 1% of all CVEs
- Weakness
- CWE-79
- Attack vector
- Network, remotely reachable
Recommended actions
- 1.Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.